I'm not insinuating your personal RP is wrong. I'm insinuating that the faces are finally in-context and appropriate when compared to literally every other romanceable character in the game, evil or otherwise.
Why should Astarion get extra options, especially ones that play into this notion that he's an abuser (especially considering his own backstory, no less)? In that vein, what if I want my Tav to look sad or traumatized in Gale's kisses? Should I make a ton of new threads asking the devs to add an option especially for me, because I personally don't buy his whole "nice guy" shtick?
You're asking for content that is specific to one, very very small player preference. Neutrality allows for infinite RPs and HCs. Specificity is limiting. If Larian were to add an option for how Tav reacts to OPTIONAL kisses with AA, then they would have to do it for ALL the characters.
The new Tav x AA faces are neutral, leaning towards positive. Claiming them to be some cartoonish, overtly sexual or elated reaction is frankly hyperbolic. With these expressions, one can still easily RP a Tav in a toxic dynamic with AA. No matter what the devs add/remove/change/fix/improve, there will always be someone/s who is unhappy with it. That's why mods exist.